Shoot a deer in the same place as you would at long range. Middle of the chest. The only way to ensure one drops in the tracks is to spine it or break both front shoulders. The spine is an "iffy" shot in my opinion and hitting both shoulders wastes too much meat. Punch the lungs and get the skinning knife ready.
Deer react differently to shots. Some drop on their chin and another may run off even if they are hit in identical spots. Different animals, different reactions. But if you hit the heart/lung area you'll kill the deer. May have to follow it a little ways but that is always a fatal shot.